be.SIRAPRISE.ra

Class SummarizebyProxy

java.lang.Object

be.SIRAPRISE.ra.RelationProxy

be.SIRAPRISE.ra.SummarizebyProxy

All Implemented Interfaces:

IRelation

public final class SummarizebyProxy
extends RelationProxy

SummarizebyProxy

Author:

erwin

Constructor Summary

Constructors

Constructor and Description
SummarizebyProxy(RelationProxy input, java.util.Set<NameIdentifier> byAttributes, java.util.Map<NameIdentifier,java.lang.String> expressions) Creates the SummarizebyProxy

Method Summary

Modifier and Type	Method and Description
java.lang.String	getHostExpressionEvaluationText() Gets The expression text for the expression to be evaluated by the host

Methods inherited from class be.SIRAPRISE.ra.RelationProxy

aggregate, dividedyper, extend, getHost, getRelationBuffer, group, gtclose, intersect, intersectUsing, isProxy, join, joinUsing, leftJoin, leftJoinUsing, minus, minusUsing, pack, project, rename, restrict, semijoin, semijoinUsing, semiminus, semiminusUsing, summarizeby, tclose, transform, ungroup, union, unionUsing, unpack, xminus, xminusUsing

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SummarizebyProxy

public SummarizebyProxy(RelationProxy input,
                        java.util.Set<NameIdentifier> byAttributes,
                        java.util.Map<NameIdentifier,java.lang.String> expressions)

Creates the SummarizebyProxy

Parameters:

input - the relation to be summarized

byAttributes - the specification of the tuple grouping to be applied

expressions - the specifications of the summaries to be computed

Method Detail

getHostExpressionEvaluationText

public java.lang.String getHostExpressionEvaluationText()

Description copied from interface: IRelation

Gets The expression text for the expression to be evaluated by the host

Specified by:

getHostExpressionEvaluationText in interface IRelation

Specified by:

getHostExpressionEvaluationText in class RelationProxy

Returns:

The expression text for the expression to be sent to the host for evaluation